Opinion:
Timing is a important factor here. My bet is those enterprise companies skipped the .NET/JavaEE era and will jump right into what is coming next.
I know a couple of banks that are heavy Adabas/Natural users for decades. When .NET/JavaEE boomed they opted to just wait. Now, no single framework can really solve most of your problems. In fact, the problems are so heterogeneous that using frameworks at all is becoming completely irrelevant.
That said, .NET, JavaEE, Rails, Django, they are all dead to a certain point. What we will see is the rise of the non-frameworks. People will start doing their own stuff on Go (or anything else) and maybe will start open sourcing parts of it. You will have a lot of mini libraries that you will put together to fit your needs.